Overview
Blood culture is the pathway that recovers microorganisms from blood using inoculated bottles, continuous or intermittent detection, direct smear on positives, and subsequent identification with preliminary/final reporting.
Classification
| Product | Timing | Lab action |
|---|---|---|
| Instrument flag | Variable TTP | STAT Gram; do not skip |
| Preliminary smear | Minutes after flag | Notify per local critical list |
| Colony ID | After subculture | Continue workup; update report |
| Final report | After validated hold / completed ID | Close episode per SOP |
Morphologic Features
Gram morphology from positive bottles is an early reportable product that guides clinical teams before colonies are available. Describe morphology carefully; do not over-call species from smear alone.
Laboratory Characteristics
- Aerobic ± anaerobic bottle sets per local menu
- Instrument loading and alarm response
- STAT smear queue for positives
- Critical-call documentation
Reference Intervals
Target draw volumes, number of sets, bottle menus, incubation duration, and critical-notification rosters are institutional, verify local SOP.
Clinical and Laboratory Significance
True positives support bloodstream infection evaluation. Contaminants should be recognized using organism type and positivity pattern so reports do not overstate significance.
Differential Considerations
Differentiate true bacteremia/fungemia from skin-flora contamination and from false instrument signals investigated per manufacturer/SOP troubleshooting.
Comparison Tables
Blood-culture decision cues
| Finding | Laboratory emphasis | Avoid |
|---|---|---|
| Positive flag | STAT Gram ± notify | Therapy advice from flag alone |
| CoNS in 1/4 bottles | Possible contaminant (local rules) | Automatic full pathogen framing |
| S. aureus / Gram-neg rods | Typically full workup + notify path | Delaying smear |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge bottle menus, hold times, and critical lists as local
- No treatment or dosing language after smear notification
- Document who was notified and when
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
Common questions about using this Blood Culture foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Blood Culture laboratory reference?
Blood Culture is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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Can reference details vary between laboratories?
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